I was wondering if anybody has better gains with something other than a Flowmaster. I have always slapped a Flow in and dropped a K&N in every truck I have owned. I saw people on others forums downing the Flowmaster. It a 05' Ram 3.7 Auto.

 

I would imagine that the stock set up would flow enough for the 3.7 You don't want to open the diameter up b/c you'll lose precious low end torque. If anything, I'd just replace the muffler only.

 

I simply replaced the muffler (Flowmaster), it sounds much much better and there was a noticeable increase in throttle response. I couldn't be happier. Added a K&N and not really noticed anything.